need some help with megan exhaust

[*(The WOlF)*]

i have the megan drift spec exhaust and im getting kinda tired of that bees in a can sound. does anyone know how to take out the silencer.

[navylife59]

Actually the silencer is probably what is keeping it from sounding like Africanized Honey Bees in a Can or AHBC for short. AHBC and its varrying degrees of buzz are a result of resonances (pressure waves) in the exhaust system. These waves build in intensity in direct correlation to engine RPM. As the RPM increases, the pressure waves increase untill they begin to harmonize with its environment (exhaust piping). At that point, a resonance wave is created that reflects and defelects within the exhaust causing the metal buzzing sound.

This is very similar to being in a wall-to-wall ceramic tile room (aka public school bathroom) and humming a low to mid-bass monotone frequency. Slowing increasing the pitch of the frequency will eventually get you to the environmental resonance frequency of the room. Once your pitch matches this frequency, your hum will nearly double in strength and cause thin, flexible panels to vibrate. These, in turn, motivate more air molecules into resonating at that frequency making it louder. Because this room and your exhaust is not a perfect square, you get reflections that can phase shift the frequency 1/4 to 1/2 to 3/4 out-of-phase. This will either attenuate or increase the resonance vibration. The amplitude of the resonance may be so strong that it will actually begin to vibrate items outside of the environment of the room. This especially holds true to vehicles with their plethora of thin, metal panels.

Long explanation short; a proper sized resonator would be required to attentuate the bizzay bees in your can.

[*(The WOlF)*]

yah i took it off already and it sounds great. but the check light turned on. i took it to a autozone cause they do diagnostic checks for free but it couldnt read the cars computer

[navylife59]

What are your other exhaust mods? Just the muffler/silencer change should not cause a MIL (CEL for the non Toyo types).

[*(The WOlF)*]

Originally Posted by navylife59

What are your other exhaust mods? Just the muffler/silencer change should not cause a MIL (CEL for the non Toyo types).

i hav an injen intake and megan headers

[navylife59]

The headers did it and removing the silencer stopped enough of the BP to throw the MIL. Is that the DTC (diagnostic trouble code) that caused the light?

[*(The WOlF)*]

Originally Posted by navylife59

The headers did it and removing the silencer stopped enough of the BP to throw the MIL. Is that the DTC (diagnostic trouble code) that caused the light?

yah it is the dtc .tht is wht i was thinking. i put the headers and exhaust on the same day and it was fine, but the day i took off the silencer and took it out on the highway the light turned on. so im guessing i should just take it to the dealer so tht they can clear it

[navylife59]

Don't go to the dealer. Just do this simple fix in our Tech Article section to end the code from being thrown. Autozone can read your DTC and clear the MIL with a scanner for free.

[*(The WOlF)*]

Originally Posted by navylife59

Don't go to the dealer. Just do this simple fix in our Tech Article section to end the code from being thrown. Autozone can read your DTC and clear the MIL with a scanner for free.

I took it but the machine wasn't able to connect to the cars computer. and they cant clear the code at autozone though

[navylife59]

The Acutek scanner works on my 2005. They sell those at Autozone.